what the hell is going on

hey all,i'm fairly confused at the min n some advise would be welcome.

my af was due on sunday jus gone. 23rd aug. however i started with light spottin the sunday before that 16th aug which lasted 6 days, i had a few odd cramps but nothin major, i thought it may be an implant bleed but didn't think much of it. i keep note of all my af dates and have a 28 day cycle, have done since coming off pill last november, my last 'proper' af was 26th july and lasted 6/7 days.

the light spotttin was very light, only wore a liner and didn't have to change it at all durin day (obviously did for hygiene), my ususal af is spotting, then heavy for 3/4 days then spottin again for last few days

i did a test on thur and monday jus gone and bfn. and today wen i looked in knickers sorry tmi, i had the lightest spottin ever ever, and same yesterday, with a light cramp feeling

ok so i'm pretty much confused, was i too early to test maybe? or is this one for the doctor?